Getting Started on RTTY link here
IGADUMA terminal unit manual
AMSAT-UK have a manual for the IGADUMA at http://ukamsat.files.wordpress.com/2014/01/igaduma-rtty-terminal-unit.zip
BARTG Tuning Aids booklet here
Paper rolls, tape and ribbon supplies (updated June 2015) here
Godfrey G4GLM offers some suggestions for obtaining rolls of paper, paper tape, ink ribbons and belts for some Creed teleprinters. He also offers some thoughts on manual cycling of the Creed 444.
If you have articles that you feel may be of interest, please forward the content, ideally in PDF format, here.